(I edited the broken format of my previous post) What other use cases are there?
On Mon, Apr 22, 2019 at 11:20 AM #!/JoePea <[email protected]> wrote: > > WeakSets are perfect for branding and are how I would expect web > platform class branding to be explained. > > > > ```js > > const foos = new WeakSet(); > > > > class Foo { > > constructor() { > > foos.add(this); > > } > > > > method() { > > if (!foos.has(this)) { > > throw new TypeError("Foo.prototype.method called on an > incompatible object!"); > > } > > } > > } > > ``` > > Just curious, is that effectively the same as what the (current) [private > fields proposal](https://github.com/tc39/proposal-class-fields) offers? > > ```js > class Foo { > #isFoo = true > > method() { > if (this.#isFoo) { > throw new TypeError("Foo.prototype.method called on an incompatible > object!"); > } > } > } > ``` > > - Joe >
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